src/cobalt/media/base/cdm_callback_promise.cc

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cobalt/media/base/cdm_callback_promise.h"

#include "base/callback_helpers.h"
#include "base/logging.h"

namespace cobalt {
namespace media {

template <typename... T>
CdmCallbackPromise<T...>::CdmCallbackPromise(
    const base::Callback<void(const T&...)>& resolve_cb,
    const PromiseRejectedCB& reject_cb)
    : resolve_cb_(resolve_cb), reject_cb_(reject_cb) {
  DCHECK(!resolve_cb_.is_null());
  DCHECK(!reject_cb_.is_null());
}

template <typename... T>
CdmCallbackPromise<T...>::~CdmCallbackPromise() {
  if (IsPromiseSettled()) return;

  DCHECK(!resolve_cb_.is_null() && !reject_cb_.is_null());
  RejectPromiseOnDestruction();
}

template <typename... T>
void CdmCallbackPromise<T...>::resolve(const T&... result) {
  MarkPromiseSettled();
  base::ResetAndReturn(&resolve_cb_).Run(result...);
}

template <typename... T>
void CdmCallbackPromise<T...>::reject(MediaKeys::Exception exception_code,
                                      uint32_t system_code,
                                      const std::string& error_message) {
  MarkPromiseSettled();
  base::ResetAndReturn(&reject_cb_)
      .Run(exception_code, system_code, error_message);
}

// Explicit template instantiation for the Promises needed.
template class MEDIA_EXPORT CdmCallbackPromise<>;
template class MEDIA_EXPORT CdmCallbackPromise<std::string>;

}  // namespace media
}  // namespace cobalt